244 MOLLUSCA. 
Having examined a number of specimens of “3B. marie” from Texas in German 
collections, 1 can fully endorse Binney’s remarks ® :—“ This species is readily distin- 
guished from the allied forms by its greater solidity, its highly polished surface, its 
more elongated form, its dark-coloured aperture, bordered with the white internal 
margin of the peritreme, and the tooth-like callus upon the upper portion of the 
columella.” But it is somewhat strange that Say himself! does not mention the 
conspicuous brown colour of the interior of the aperture, but says only “labrum... . 
within white, with a perlaceous tinge,” which is true as regards a zone of 2 millim. 
in breadth immediately behind the margin of the aperture; all the rest of the 
description, and especially ‘the thickened line or rib on the inner submargin,” agrees 
well with our species. Most specimens show, indeed, more or less distinctly, a peculiar 
circumscribed tubercle in the middle of the columellar margin, which is seen neither 
in B. dealbatus nor in B. schiedeanus; but in some this tubercle is less conspicuous, 
which may account for Cockerell’s distinction of varieties with and without tooth on 
the columella’. 
Bulimus lactarius (Menke) was described by Pfeiffer 11 at a time when B. alternatus 
was not known to him by autopsy (Symb. Hist. Helic. iii. p. 52); it was subsequently 
identified with B. alternatus by the author himself (Monogr. Helic. Vivent. vi. p. 122, 
and vili. p. 158). His original description 1! agrees very well with our species, except 
that the tubercle on the columella is not mentioned; but this is sometimes very small, 
and only visible when one looks obliquely into the aperture. Reeve’s figure 217a agrees 
better with B. schiedeanus, var. patriarcha ; and the same is probably meant by H. and 
A. Adams, who place lactarius with schiedeanus in their subgenus Mesembrinus (Gen. Moll. 
ii. p. 157). Cockerell? distinguishes somewhat artificially the following varieties :— 
(1) with grey or brownish streaks, (a) without columellar tooth (alternatus, Say), 
(6) with columellar tooth (marie, Alb.); (2) one-coloured, white, (a) without columellar 
tooth (alb¢dus, Taylor) (not described), (4) with columellar tooth (dinneyanus, Binn.). 
The locality “Tehuantepec” is so far distant from the others that I should have 
excluded it altogether if it had not been recorded by Bland and Binney , to whom 
we must give full credit for their knowledge of this species. Forbes (P. z. S. 1850, 
p. 54) mentions it even from Panama; but in this case the correctness of the determi- 
nation is not so trustworthy. 
The name “marie” was given to this shell by Albers 14 on account of his recognition 
of it as a supposed new species on the twelfth birthday of his daughter Mary. 
3. Bulimulus sufflatus. 
Bulimulus vesicalis, A. Gould, Bost. Journ, Nat. Hist. vi. p. 875, t. 14. fig. 1 (1858)'; Carpenter, 
P. ZS. 1856, p. 203°; Gabb, Am. Journ. Conch. iii. p. 237, t. 16. fig. 6 (1868)*; Pfr. 
Monogr. Helic. Vivent. iv. p. 467* [mot Pfr. Monogr. Helic. Vivent. iii. p. 654 (1853), and 
